CN201512787U

CN201512787U - Horizontal load-bearing enhancement pre-stressed concrete centrifugal square-sectioned pile

Info

Publication number: CN201512787U
Application number: CN2009202238485U
Authority: CN
Inventors: 许景新
Original assignee: Henan Jianhua Concrete Pile Co Ltd
Current assignee: Henan Jianhua Concrete Pile Co Ltd
Priority date: 2009-09-28
Filing date: 2009-09-28
Publication date: 2010-06-23
Anticipated expiration: 2019-09-28

Abstract

The utility model discloses a horizontal load-bearing enhancement pre-stressed concrete centrifugal square-sectioned pile, which comprises concretes, a reinforcement cage and end plates fixed on two ends of the reinforcement cage, wherein the reinforcement cage comprises pre-stressed reinforcements, stirrups and non-prestressed reinforcements, the pre-stressed reinforcements, the stirrups and the non-prestressed reinforcements are fixedly connected, the diameter of the pre-stressed reinforcement is equal to or different from that of the non-prestressed reinforcement, the non-prestressed reinforcements are longitudinally bound on the stirrups, and the non-prestressed reinforcements do not participate in pre-stressed stretch-draw after centrifugal square-sectioned pile compound dies. The centrifugal square-sectioned pile changes the shortcomings that the prior centrifugal square-sectioned piles are provided with bad anti-bending performances, brittle failure, bad ductility and rapid spreading after centrifugal square-sectioned piles are cracked, tension zone reinforcements can quickly enter yield and retrenchment even fracture, and the difference of ultimate bending moments and cracking bending moments are not significant. The centrifugal square-sectioned pile has the advantages of enhancing entire performances of pipe piles and providing simple process, low cost, high cost performance, broad range of application and the like.

Description

Horizontal bearing reinforced prestress concrete offcenter squared pile

Technical field:

The utility model belongs to construction engineering technical field, is specifically related to a kind of horizontal bearing reinforced prestress concrete offcenter squared pile.

Background technology:

In building construction process, the utilization of offcenter squared pile more and more widely, prestress square pile is to adopt the method for pressurization in advance to improve concrete tensile strength indirectly, overcome the concrete shortcoming of cracking easily, can delay the cracking of concrete component, improve the crack resistance and the rigidity of member, and obtain the saving reinforcing bar, alleviate the effect of deadweight.

But engineering circle generally believes that the anti-bending strength of prestress square pile is poor, destroys to be brittle fracture, and ductility is poor, and carrying out rapidly behind the cracking appears in prestress square pile, and tension goes reinforcing bar to enter surrender and constriction very soon until fracture, and ultimate bending moment and cracking moment are more or less the same.The approach that improves the cracking resistance moment of flexure mainly is to improve the concrete prestressing force of prestress square pile, promptly improve concrete compressive pre-stress indirectly by pre-tensile stress or the increase number of steel bars that improves prestressed reinforcement, but the pre-tensile stress of prestressed reinforcement is excessive, plastic strain appears in reinforcing bar easily, the easy brittle failure of prestressed reinforcement when being subjected to bend, the ductility of influence side's stake, increase the increase that number of steel bars means cost and construction costs, cost performance is unbalance, and this approach just delays crack on concrete, improve ultimate bending moment and cracking moment, but for the ultimate bending moment of improvements side stake and cracking moment is more or less the same and the ductility of the side of raising less than very big actual help.Thereby these natural defects of the how side's of improvement stake have certain engineering significance.

The utility model content:

In sum, in order to overcome the deficiency of prior art problem, the utility model provides a kind of horizontal bearing reinforced prestress concrete offcenter squared pile, it is poor that it has well remedied existing prestress square pile anti-bending strength, destroy and be brittle fracture, ductility is poor, cracking back rapid spread appears in prestress square pile, the tensile region reinforcing bar enters surrender very soon and tightens until fracture, shortcomings such as ultimate bending moment and cracking moment are more or less the same improved the overall performance of prestress square pile, and technology are simple, cost is low, the cost performance height.

For solving the problems of the technologies described above, the technical solution adopted in the utility model is:

A kind of horizontal bearing reinforced prestress concrete offcenter squared pile, comprise the end plate 6 that concrete 4, cage of reinforcement cage 5 and cage of reinforcement cage 5 two ends are fixing, wherein, cage of reinforcement cage 5 comprises prestressed reinforcement 2, stirrup 3 and nonprestressed reinforcement 1, and prestressed reinforcement 2, stirrup 3 and nonprestressed reinforcement 1 are fixedly connected.

Further, described concrete offcenter squared pile cross sectional shape or be square or for rectangle.

Further, described nonprestressed reinforcement 1 is evenly distributed on the interior stirrup 3 of whole offcenter squared pile.

Further, described nonprestressed reinforcement 1 is evenly distributed on the stirrup 3 on two symmetrical limits on the offcenter squared pile cross section.

Further, described nonprestressed reinforcement 1 is evenly distributed on the stirrup 3 on two symmetrical limits on the offcenter squared pile cross section, and the stirrup 3 on its two other symmetrical limit also is provided with nonprestressed reinforcement 1.

Further, the diameter of the diameter of prestressed reinforcement 2 and nonprestressed reinforcement 1 or identical, or different.

The beneficial effects of the utility model are:

1, it is poor that the utility model has well remedied existing prestress square pile anti-bending strength, destroy and be brittle fracture, ductility is poor, cracking back rapid spread appears in side stake, and the tensile region reinforcing bar enters surrender very soon and tightens until fracture, ultimate bending moment and cracking moment shortcoming such as be more or less the same, improved the overall performance of prestress square pile, and technology is simple, and cost is low, the cost performance height.

2, because the novel stake of the utility model has very high cracking moment and ultimate bending moment, and ductility is improved significantly, can be anti-skidding at the bank protection of water conservancy projectss such as rivers, lake ripple, reservoir, be extensive use of in the engineerings such as dam body soil stabilization, also anti-skidding in side slope maintenance, the side slope of infrastructure such as highway, railway, the pier footing construction, the port and pier foundation construction is reinforced, the deep foundation pit support of industry and civilian construction, fields such as side slope maintenance are extensive use of.And in the foundation construction of the earthquake proof construction more than 7 grades, also can use.

Description of drawings:

Fig. 1 is a structural representation of the present utility model;

Fig. 2 is the left view of the utility model Fig. 1;

Fig. 3 is the schematic cross-section of structure one of the present utility model;

Fig. 4 is the schematic cross-section of structure two of the present utility model;

Fig. 5 is the schematic cross-section of structure three of the present utility model;

Fig. 6 is the schematic cross-section of structure four of the present utility model;

Fig. 7 is that bending resistance experiment of the present utility model loads sketch.

The specific embodiment:

The utility model is described in further detail below in conjunction with drawings and Examples.

Embodiment one

As Fig. 1, Fig. 2, shown in Figure 3, its cross sectional shape of present embodiment offcenter squared pile is a square, its length of side is 600, its internal diameter is ￠ 200, can adopt conventional formulation design concrete semi-finals degree grade is C60, it is the high-strength prestressed concrete rod iron of ￠ 10.7 that prestressed reinforcement 2 can adopt eight diameters, and its tensile strength is 1570Mpa, the HRB335 screw-thread steel that it is ￠ 14 that nonprestressed reinforcement 1 can adopt eight diameters.

With prestressed reinforcement 2, nonprestressed reinforcement 1, stirrup 3 fixed length, cut-out blanking, with prestressed reinforcement 2 headings, the wire rod cold-drawn becomes hand-drawn wire more earlier; Prestressed reinforcement 2 becomes the steel cage with stirrup 3 roll weldings, with the inboard of the stirrup 3 in nonprestressed reinforcement 1 vertical colligation and the even whole offcenter squared pile that distributes, makes cage of reinforcement cage 5 again; Make end plate 6, cage of reinforcement cage 5 is put into mould after end plate 6 is fixed; To install in the mould of cage of reinforcement cage 5 and end plate 6 according to concrete 4 feedings of country side's stake preparation standard preparation, and carry out prestressed stretch-draw behind the closed die lid, nonprestressed reinforcement 1 does not participate in prestressed stretch-draw; And then mould placed carry out centrifugal forming on the centrifuge, topple over surplus slurry after finishing; Then mould is put into steam-cured pond, carried out stream curing by the strength grade of concrete requirement; Put after the stream curing open, the demoulding, quality inspection is then gone into still and is carried out steam curing at high pressure after the quality inspection, after the side of putting into stake stack the field, carry out natural curing.

As shown in Figure 7, behind present embodiment offcenter squared pile moulding twenty four hours, the present embodiment offcenter squared pile is carried out the bending resistance experiment, when the present embodiment offcenter squared pile destroys, the top of offcenter squared pile (is the boundary with offcenter squared pile diameter of bore place) concrete 4 is crushed, and the prestressed reinforcement 2 of bottom and nonprestressed reinforcement 1 do not rupture, article one crack appears from offcenter squared pile, the offcenter squared pile fracture extension is slow, crack quantity increases fast, but rupture the Breadth Maximum in preceding crack only for 0.5mm at offcenter squared pile, crack quantity is 16 during destruction, the crack does not extend to offcenter squared pile stake top, offcenter squared pile bottom prestressed reinforcement 2 and nonprestressed reinforcement 1 fracture lag behind, and the crushing phenomenon appears in top concrete 4, meets the overreinforced component damage form of prestressed concrete, illustrate that the present embodiment offcenter squared pile has good ductility, cracking moment and ultimate bending moment differ bigger.

Embodiment two

As shown in Figure 4, repeat embodiment 1, following difference is arranged: it is the high-strength prestressed concrete rod iron of ￠ 10.7 that prestressed reinforcement 2 can adopt eight diameters, its tensile strength is 1570Mpa, the HRB335 screw-thread steel that it is ￠ 16 that nonprestressed reinforcement 1 can adopt four diameters, nonprestressed reinforcement 1 vertical colligation and evenly being evenly distributed are distributed in stirrup 3 inboards on two symmetrical limits on the offcenter squared pile cross section.

Embodiment three

As shown in Figure 5, repeat embodiment 1, following difference is arranged: it is the high-strength prestressed concrete rod iron of ￠ 10.7 that prestressed reinforcement 2 can adopt eight diameters, its tensile strength is 1570Mpa, it is the HRB335 screw-thread steel of ￠ 16 that nonprestressed reinforcement 1 can adopt six roots of sensation diameter, stirrup 3 inboards on nonprestressed reinforcement 1 stirrup 3 inboards of vertical colligation on two symmetrical limits on the offcenter squared pile cross section, its two other symmetrical limit also are provided with nonprestressed reinforcement 1.

Embodiment four

As shown in Figure 6, repeat embodiment 1, following difference is arranged: its cross sectional shape of present embodiment offcenter squared pile is a rectangle, its length of side is 700X600, its internal diameter is ￠ 300, and it is the high-strength prestressed concrete rod iron of ￠ 10.7 that prestressed reinforcement 2 can adopt 12 diameters, and its tensile strength is 1570Mpa, the HRB335 screw-thread steel that it is ￠ 16 that nonprestressed reinforcement 1 can adopt 12 diameters, the inboard of the stirrup 3 in the nonprestressed reinforcement 1 vertical colligation and the whole offcenter squared pile that evenly distributes.

Be noted that at last, the above embodiment is to the explanation of technical solutions of the utility model and unrestricted, other modification that is equal to replacement or makes of affiliated technical field those of ordinary skill according to prior art, as long as do not exceed the thinking and the scope of technical solutions of the utility model, all should be included within the desired interest field of the utility model.

Claims

1. horizontal bearing reinforced prestress concrete offcenter squared pile, comprise the end plate (6) that concrete (4), cage of reinforcement cage (5) and cage of reinforcement cage (5) two ends are fixing, it is characterized in that: cage of reinforcement cage (5) comprises prestressed reinforcement (2), stirrup (3) and nonprestressed reinforcement (1), and prestressed reinforcement (2), stirrup (3) and nonprestressed reinforcement (1) are fixedly connected.

2. horizontal bearing reinforced prestress concrete offcenter squared pile according to claim 1 is characterized in that: described horizontal bearing reinforced prestress concrete offcenter squared pile cross sectional shape or for square or for rectangle.

3. horizontal bearing reinforced prestress concrete offcenter squared pile according to claim 1 and 2 is characterized in that: described nonprestressed reinforcement (1) is evenly distributed on the interior stirrup (3) of whole offcenter squared pile.

4. horizontal bearing reinforced prestress concrete offcenter squared pile according to claim 1 and 2 is characterized in that: described nonprestressed reinforcement (1) is evenly distributed on two symmetrical limits on the offcenter squared pile cross section on the stirrup (3).

5. horizontal bearing reinforced prestress concrete offcenter squared pile according to claim 1 and 2, it is characterized in that: described nonprestressed reinforcement (1) is evenly distributed on two symmetrical limits on the offcenter squared pile cross section on the stirrup (3), also is provided with nonprestressed reinforcement (1) on the stirrup (3) on its two other symmetrical limit.

6. horizontal bearing reinforced prestress concrete offcenter squared pile according to claim 1 and 2 is characterized in that: the diameter of the diameter of described prestressed reinforcement (2) and nonprestressed reinforcement (1) or identical, or different.